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Multiplying Fractions
TeacherTwinsΒ©2015
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Warm Up Add. Write the answer in simplest form. 10 π π - 1 π ππ π π - 7 π π 3. 13 π π - 2 π ππ π π 8 π ππ 8 ππ ππ 11 π π 10 π π
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Example 1: Multiply π π x π π Multiply numerators and multiply denominators. π π x π π = π ππ
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Example 2: Multiply π π x ππ ππ π π x ππ ππ = ππ πππ ππ πππ = π ππ
Simplify the fraction by dividing by the GCF. π π x ππ ππ = ππ πππ Γ· 10 ππ πππ = π ππ Γ· 10
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Solve by cross reducing.
Example 2: Multiply π π x ππ ππ Solve by cross reducing. Look at numerator and denominator across from each other. Find the GCF. If it is a number other than one, divide both by it. 1 π π x ππ ππ 5 1 14 = π ππ Multiply new numerators and denominators.
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Example 3: You need to seed π π of the front yard with new grass
Example 3: You need to seed π π of the front yard with new grass. The area of the yard is 534 square feet. How much of the yard needs to be seeded? π π x 534 = 356 square feet
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Practice Multiply. π π x π π π π x π π π π x ππ ππ π π x ππ ππ π ππ
π ππ π ππ ππ ππ
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Closure Explain how multiplying π ππ and π ππ is similar to multiplying 0.4 and 0.3. You find the product of 4 and 3 in both problems.
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